Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 42, Issue 5, Pages 3122-3129Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2016.09.159
Keywords
ZnCo2O4; Ni-foam; Hybrid supercapacitor; Hydrothermal
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Funding
- Priority Research Centers Program through the National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology (MEST) of the Korean government [2009-0093818]
- National Research Foundation of Korea [22A20130000138, 2009-0093818] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Thin layered nanosheets of ZnCo2O4 with desirable porous nanoarchitecture grown on Nifoam were prepared using a simple surfactant free hydrothermal method. The Ni-foam supported ZnCo2O4 nanostructure was characterized using X-ray diffraction (XRD) analysis, field emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM). FESEM clearly revealed thin nanosheets which were randomly connected together to form a porous structure. The binder-free Ni-foam supported ZnCo2O4 electrode was applied directly to hybrid supercapacitor analysis. In three electrode measurement, thin layered nanosheets of ZnCo2O4 exhibited a maximum specific capacity of 886 C g(-1) at a current density of 2 mA cm(-2). When the current density was increased from 2 to 50 mA cm(-2), the specific capacity value was 362.5 C g(-1). After 2000 continuous charge discharge cycles, about 94% of the maximum specific capacity was retained. This high specific capacity, better rate capacity, and excellent cyclic stability of thin layered nano sheets of ZnCo2O4 suggest that the prepared electrode is a promising candidate for hybrid supercapacitor applications. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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